Abdominal-muscle Rigidity Induced by Morphine and Nitrous Oxide

Abstract

Standard and integrated abdominal-muscle electromyograms and H reflex amplitudes of nine volunteers mechanically ventilated to maintain normal Paco2 were studied. Morphine, 2 mg/kg, was given iv during ventilation with oxygen. One hour later 70 per cent nitrous oxide-30 per cent oxygen was substitut